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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc87c20fb0788a70339c9f15664fb1f14aa1c0b51b9589ba4ff11a5249fe882' 
  AND token = 'pE5S+HoGPV9/EOpgE1W88q+0Z1c7z7dK4et6f9Lh0LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}